These layers succeed in layering because it feels as if one is looking at different kaleidoscopes. Each layer has a unique color or shape that leads to all of the other unique layers rather than just combining shading to make one object. In a way, the layers in these works are their own individual objects that complement one another in succession to bring us very spontaneous designs.

Source:

http://www.demilked.com/layered-paper-art-maud-vantours/